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-8(10+m)=40
We move all terms to the left:
-8(10+m)-(40)=0
We add all the numbers together, and all the variables
-8(m+10)-40=0
We multiply parentheses
-8m-80-40=0
We add all the numbers together, and all the variables
-8m-120=0
We move all terms containing m to the left, all other terms to the right
-8m=120
m=120/-8
m=-15
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